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Electrocondution slurry for solar cell and manufacturing method thereof

A technology of conductive paste and glass powder, which is used in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc. Cell efficiency and other issues, to avoid bonding vacuum, high photoelectric conversion efficiency, and high aspect ratio

Active Publication Date: 2013-09-11
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The softening point of the glass powder prepared by this method is generally 450-600°C. During the final sintering process of the paste printed on the battery sheet, the volatilization temperature of the organic carrier is low, and most of it is generally volatilized at 300-400°C, while the glass powder is still If it does not start to soften, the result is that the organic carrier as a low-temperature binder cannot play a role in bonding. Usually, the glass frit of the high-temperature binder has not started to work, and the slurry will collapse on the silicon wafer, resulting in The width increases, blocking the light-absorbing area of ​​the silicon wafer, thereby reducing the efficiency of the cell

Method used

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preparation example Construction

[0012] The present invention also provides a preparation method of the above-mentioned glass powder, comprising the steps of: mixing lead borosilicate glass and hydrate to prepare glass powder. Specifically, it can be described as follows: after mixing boron oxide, silicon oxide and lead oxide, melting at 1200-1400°C, water quenching, ball milling, adding hydrate under high-speed stirring, and mixing uniformly to obtain the glass powder of the present invention.

[0013] The preparation method of the above-mentioned glass powder is further preferably described as, step 1: Put lead oxide, boron oxide and silicon oxide into a ball mill jar, add grinding balls (such as zirconia, aluminum oxide, agate), and the ball-to-material ratio is 3-8:1, the ball milling medium can be deionized water or absolute ethanol, the ball milling speed is 200-500 rpm, the ball milling time is 8-48h, after the ball milling is completed, take it out, dry it at 80°C to get the mixture; steps 2: Weigh th...

Embodiment 1

[0025] Weigh raw materials according to weight ratio: 5.95g of lead borosilicate glass (among them, 50w% of silicon oxide, 17wt% of boron oxide, 29wt% of lead oxide, 4wt% of calcium oxide), 1.05g of sodium tetraborate decahydrate, to obtain glass powder; Silver powder 83g (spherical 49g; sheet 34g); organic vehicle 10g (terpineol 5g, butyl carbitol 2.5g, ethyl cellulose 0.5g, sodium carboxymethyl cellulose 0.2g, lecithin 1.2g, ortho Dibutyl phthalate 0.6g).

[0026] Mix the weighed silver powder, organic vehicle and glass powder, and grind them evenly on a three-roll mill to obtain the conductive paste S1 for solar cells.

Embodiment 2

[0028] Weigh raw materials according to weight ratio: lead borosilicate glass 5.6g (among them, silicon oxide 60w%, boron oxide 3wt%, lead oxide 25wt%, calcium oxide 4wt%, zinc oxide 8%), sodium tetraborate decahydrate 1.4g , to get glass powder; silver powder 83g (spherical 49g; sheet 34g); organic carrier 10g (terpineol 5g, butyl carbitol 2.5g, ethyl cellulose 0.5g, sodium carboxymethyl cellulose 0.2g, egg Phospholipids 1.2g, dibutyl phthalate 0.6g).

[0029] Mix the weighed silver powder, organic vehicle and glass powder, and grind them evenly on a three-roll mill to obtain the conductive paste S2 for solar cells.

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Abstract

Electrocondution slurry comprises silver powder, glass powder and an organic carrier, wherein the glass powder comprises boron lead silicate glass and hydrate, and the lead silicate is I-II main-species hydrate of the periodic table of the elements. A solar cell sheet manufactured by the electrocondution slurry manufactured by the glass powder is high in photoelectric conversion efficiency and large in depth-width ratio.

Description

technical field [0001] The invention relates to a conductive paste and a preparation method thereof, more specifically, the present invention relates to a conductive silver paste for a solar cell and a preparation method thereof. Background technique [0002] The front and back conductive pastes for solar cells are generally prepared from raw materials such as metal powder, glass powder and organic vehicle. Taking the conductive silver paste as an example, the glass powder melts at high temperature, which melts the sunlight anti-reflection layer on the silicon surface, so that the silver in the conductive paste contacts the silicon surface, and the silver powder can be combined with silicon at high temperature under the action of the glass powder. Ag / Si conductive islands are formed, and the silver wire and silicon can form a good ohmic contact; at the same time, the glass adhesive attaches the silver powder to the surface of the silicon wafer, connects the conductive island...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01B13/00
Inventor 舒剑王美艳
Owner BYD CO LTD
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